General refurbishments that are not governed by the National Construction Code (NCC) are often overseen by body corporate organisations, which set their own requirements for hybrid flooring acoustic rating. Many of these organisations follow the Association of Australian Acoustical Consultants Guidelines (AAAC), a not-for-profit industry organisation that provides guidelines to acoustic engineers. The AAAC has developed a guideline star rating system to rank the performance of flooring products for impact isolation between floors. This system rates acoustic performance out of 6 stars and uses the LnT,w index for in-situ measurements, with the “T” indicating that the testing is done in situ and not in a lab. For more information, refer to the AAAC Guideline for Apartment and Townhouse Acoustic Rating.
Here’s an edited version of the table with some formatting improvements:
Star Rating Impact Insulation Class (IIC) LnT,w NCC Pass/Fail Speech Audibility
2 Star H H ≤ 65 dB Fail Normal Speech Audible
3 Star H H H ≤ 55 dB Pass Just Audible
4 Star H H H H ≤ 50 dB Pass Not Audible
5 Star H H H H H ≤ 45 dB Pass Not Audible
6 Star H H H H H H ≤ 40 dB Pass Not Audible